论文标题
排除通过原始重力背景排除通货膨胀的挑战
The challenge of ruling out inflation via the primordial graviton background
论文作者
论文摘要
关于通货膨胀范式的可检验性的最新辩论引发了一个问题，即如何与竞争性场景区分开来模型。我们认为，检测宇宙重力背景（CGB）是围绕普朗克时间解耦的重力辐射的遗物辐射，将排除通货膨胀范式，因为现实的通货膨胀模型将CGB稀释到无法观察到的水平。 CGB对相对论物种的有效数量的贡献，$Δn_ {{\ rm eff}，g} \大约0.054 $，在下一代宇宙学探针的范围内。我们认为，检测与CGB相关的高频随机引力背景将是具有挑战性的，但可能是可行的。我们简要讨论通货膨胀替代方案的期望，重点是弹跳宇宙学和新兴情景。
Recent debates around the testability of the inflationary paradigm raise the question of how to model-independently discriminate it from competing scenarios. We argue that a detection of the Cosmic Graviton Background (CGB), the relic radiation from gravitons decoupling around the Planck time, would rule out the inflationary paradigm, as realistic inflationary models would dilute the CGB to an unobservable level. The CGB contribution to the effective number of relativistic species, $ΔN_{{\rm eff},g} \approx 0.054$, is well within the reach of next-generation cosmological probes. We argue that detecting the high-frequency stochastic gravitational wave background associated to the CGB will be challenging but potentially feasible. We briefly discuss expectations within alternatives to inflation, focusing on bouncing cosmologies and emergent scenarios.
